scholarly journals Physical and mathematical modeling of the moving the raw cotton between directing wall and area ginning seeds

2021 ◽  
Vol 2131 (3) ◽  
pp. 032056
Author(s):  
M Ahmedov ◽  
M Shoraxmedova ◽  
T Tuychiev ◽  
D Tashpulatov ◽  
I Cherunova
Keyword(s):  
Mathematical Modeling ◽  
Cotton Fiber ◽  
Quantitative Estimation ◽  
Experimental Studies ◽  
Raw Material ◽  
Direct Impact ◽  
Actual Problem ◽  
Working Chamber ◽  
Qualitative And Quantitative ◽  
Physical And Mathematical Modeling

Abstract In article are brought algorithm and results brought numerically-experimental studies on qualitative and quantitative estimation of the law of the moving the raw cotton from directing walls outgoing between spiked-drum and netlike surface feeder aside worker of the camera ginning machines. It is known that the uniform supply of raw cotton to the ginning process has a direct impact on the efficiency of the ginning process. In the process of ginning, the cotton is cleaned on the surface of the pile drum and net of the supplier, and the crushed gin comes to the working chamber through the gin. As a result of the rotation of the saw cylinder in the working chamber, the cotton fiber is suspended and the rotation is started. As a result of the circular motion of the raw cotton, a raw material roller is formed. In this process, the actual problem is to ensure that the raw cotton consists of small pieces and is uniform in time and width of the equipment. The Comparison got given on calculation shows that increase the corner will bring about increase the growing forming displacement. Increase of this corner will bring the leaflet of the raw cotton about increase of length free moving.

scholarly journals Investigation of ferroresonanse phenomena and its possibilities of occurrence in the operation of 6-220 kV electromagnetic transformer

2021 ◽  
Vol 288 ◽  
pp. 01058
Author(s):  
Andrew Tychkin ◽  
Andrew Yablokov ◽  
Vladimir Lebedev ◽  
Nikita Rodin ◽  
Maksim Batmanov
Keyword(s):  
Mathematical Modeling ◽  
Influencing Factors ◽  
Experimental Studies ◽  
Experimental Setup ◽  
Voltage Transformer ◽  
Physical And Mathematical Modeling

Ferroresonance phenomena lead to damage to electromagnetic measuring voltage transformers and nearby equipment. Damping devices and antiresonance transformers, which are used for preventing the occurrence of ferroresonance phenomena, are effective in a certain area of influencing factors. The article presents methods for studying the possibility of occurrence of ferroresonance phenomena in the operation of 6-220 kV voltage transformers based on physical and mathematical modeling. The results of the tests according to the developed method are the area of the existence of a dangerous ferroresonance for the voltage transformer under test or the confirmation of its antiresonance properties in a certain range of influencing factors under study. The article also describes an experimental setup based on RTDS for conducting experimental studies. The developed methods were tested in the studies of one of the types of antiresonance transformers.

Mathematical Modeling of Fire-Proof Efficiency of Coatings Based on Silicate Composition

2020 ◽  
Vol 1006 ◽  
pp. 70-75
Author(s):  
Anton Chernukha ◽  
Alexey Teslenko ◽  
Pavlo Kovalov ◽  
Oleg Bezuglov
Keyword(s):  
Mathematical Modeling ◽  
Fire Resistance ◽  
Fire Protection ◽  
Experimental Studies ◽  
Scientific Work ◽  
Quantitative Composition ◽  
Factor Space ◽  
Mathematical Planning ◽  
Qualitative And Quantitative ◽  
Planning Of Experiments

The paper analyzes the scientific work on fire protection, fire resistance, mathematical modeling of fire-proof properties, mathematical planning of experiments. The factors determining the efficiency of fire-proof coating have been determined. The experimental technique for determining fire-proof efficiency as an output parameter was selected. A factor space was constructed, and an experimental plan was drawn up. Experimental studies of the fire-proof effect of the coating based on the xerogel of the gel-forming system at all points of the factor space were carried out. A regression equation was obtained that describes the effect of the qualitative and quantitative composition of the coating on its fire-proof efficiency.

Mathematical fundamentals of the method of identification of metal inclusions in raw materials with automatic determination of their coordinates

2021 ◽  
Vol 103 (3) ◽  
pp. 23-32
Author(s):  
Leonid Zamikhovskyi ◽  
Ivan Levitskyi ◽  
Mykola Nykolaychuk ◽  
Yuriy Striletskyi
Keyword(s):  
Raw Materials ◽  
Experimental Studies ◽  
Conveyor Belt ◽  
Raw Material ◽  
Automatic Determination ◽  
Actual Problem ◽  
Theoretical Substantiation ◽  
Excitation Coil

The article deals with the actual problem of theoretical substantiation of the method of identification (diagnosis) of metal inclusions (hereinafter referred to as metal inclusions) in bulk raw materials under the conditions of a conveyor belt. The presence of metal inclusions in the raw material transported by the conveyor belt can lead to both emergencies and deterioration in the quality of the output product. The identification method provides for diagnosing the presence of metal inclusions, determining its dimensions, type of metal and coordinates relative to the cross-section of the conveyor belt. The results of theoretical and experimental studies of the method for identifying metal inclusions based on a scanning signal and an additional excitation coil are considered. A mathematical model has been developed for determining the position of metal inclusions on a conveyor belt relative to a line perpendicular to the axis between two excitation coils, including two trajectories for determining coordinates for three excitation coils and two receiving coils.

scholarly journals The spreading model of the material in the working chamber of the batch grinder

2019 ◽  
pp. 107-112
Author(s):  
Bratishko, V. ◽  
Rebenko, V. ◽  
Milko, D. ◽  
Khmelovska, A.
Keyword(s):  
Mathematical Model ◽  
Steady State ◽  
Bulk Material ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Surface Shape ◽  
Technological Parameters ◽  
Working Chamber ◽  
General Terms

Purpose. Set the nature of the distribution of bulk material in the working chamber of a batch grinder with a steady state of its operation. Methods. Theoretical principles of classical mechanics, mechanics of liquids and gases. Results. A general mathematical model of the material distribution in the chamber batch grinder is obtained. This model allows determining the height of the material layer at an each point in the working chamber of the batch grinder at a certain distance from the axis rotation of the working bodies and interconnects the physical and mechanical properties of the crushed raw material, technological parameters of the grinder and its mode of operation. The character of the obtained model indicates that it corresponds to the well-established ideas about the distribution of loose media in the working chamber of the batch grinder. Conclusions. As a result of theoretical studies, a mathematical model of the distribution of bulk material in a cylindrical working chamber of a batch grinder with a steady state of operation was obtained in general terms. Assumptions made in the course of research prove the feasibility of conducting experimental studies to verify the adequacy and refinement of the model. Keywords: grinding, bulk material, batch grinder, character of distribution, surface shape.

Calculation And Experimental Substantiation Of Optimal Design Of The Welded Joint Of Plates On Соver Plates

2020 ◽  
pp. 17-24
Keyword(s):  
Welded Joint ◽  
Experimental Studies ◽  
Engineering Calculation ◽  
Tensile Tests ◽  
Physical Nonlinearity ◽  
Steel Plates ◽  
Optimal Parameters ◽  
Actual Problem ◽  
Numerical Research ◽  
Cover Plates

The article is devoted to the actual problem of assigning optimal parameters for connecting steel plates on cover plates with angular welds that are widely used in construction practice. The article presents the results of a comprehensive study of operation of a welded assembly of the plates connection on cover plates. An algorithm is proposed for determining the optimal parameters of a welded joint with fillet welds on the cover plates, which makes it possible to obtain a strength balanced connection. The results of full-scale tensile tests of models were presented. These results confirmed the correctness of the assumed design assumptions, and made it possible to obtain a form of destruction, not characteristic and not described in the normative literature, expressed by cutting the main elements along the length of the overlap in the joint. The possibility of such a form of destruction was confirmed by the results of numerical research in a nonlinear formulation. The optimal parameters of the nodal welded joint determined by engineering calculation are confirmed by experimental studies, as well as by the results of numerical experiments on models of calculation schemes, taking into account the physical nonlinearity of the material operation. The obtained dependence for determining the bearing capacity of the joint by the cut-off mechanism and the expression for limiting the overlap length of the cover plates will make it possible to predict the nature of the fracture and design equally strong joints.

Applications of Bentonite to Soil Decontamination

2018 ◽  
Vol 69 (7) ◽  
pp. 1695-1698
Author(s):  
Marin Rusanescu ◽  
Carmen Otilia Rusanescu ◽  
Gheorghe Voicu ◽  
Mihaela Begea
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Laboratory Experiments ◽  
Experimental Studies ◽  
Heavy Metal Concentration ◽  
Polluted Soil ◽  
Raw Material ◽  
Soil Decontamination ◽  
Metal Retention ◽  
Removal Of Heavy Metals

A calcium bentonite from Orasu Nou deposit (Satu Mare Romania) was used as raw material. We have conducted laboratory experiments to determine the influence of bentonite on the degree of heavy metal retention. It has been observed that the rate of retention increases as the heavy metal concentration decreases. Experimental studies have been carried out on metal retention ( Zn) in bentonite. In this paper, we realized laboratory experiments for determining the influence of metal (Zn) on the growth and development of two types of plants (Pelargonium domesticum and Kalanchoe) and the effect of bentonite on the absorption of pollutants. These flowers were planted in unpolluted soil, in heavy metal polluted soil and in heavy metal polluted soil to which bentonite was added to observe the positive effect of bentonite. It has been noticed that the flowers planted in unpolluted soil and polluted with heavy metals to which bentonite has been added, the flowers have flourished, the leaves are still green and the plants whose soils have been polluted with heavy metals began to dry after 6 days, three weeks have yellowish leaves and flowers have dried. Experiments have demonstrated the essential role of bentonite for the removal of heavy metals polluted soil.

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